香港六合彩开奖 1999:2013
2013-10
香港六合彩开奖 1999:2013
搁茅蝉耻尘茅
香港六合彩开奖 1999:2013 specifies a method for calculating the expected noise-induced permanent threshold shift in the hearing threshold levels of adult populations due to various levels and durations of noise exposure; it provides the basis for calculating hearing disability according to various formulae when the hearing threshold levels at commonly measured audiometric frequencies, or combinations of such frequencies, exceed a certain value.
The measure of exposure to noise for a population at risk is the noise exposure level normalized to a nominal 8 h working day, LEX,8h, for a given number of years of exposure. 香港六合彩开奖 1999:2013 applies to noise at frequencies less than approximately 10 kHz which is steady, intermittent, fluctuating, irregular. Use of 香港六合彩开奖 1999:2013 for sound pressures exceeding 200 Pa (140 dB relative to 20 碌Pa) is recognized as extrapolation.
Informations g茅n茅rales
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脡tat actuel: 笔耻产濒颈茅别Date de publication: 2013-10Stade: Norme internationale 脿 r茅viser [90.92]
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Edition: 3
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颁辞尘颈迟茅 technique :香港六合彩开奖/TC 43ICS :13.140
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Prochaine 茅dition en cours d'茅laboration
香港六合彩开奖/DIS 1999
香港六合彩开奖/DIS 1999
Acoustique 鈥� Estimation de la perte auditive induite par le bruit
香港六合彩开奖/DIS 1999
Cycle de vie
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笔谤茅肠茅诲别尘尘别苍迟
础苍苍耻濒茅别香港六合彩开奖 1999:1990
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Actuellement
笔耻产濒颈茅别香港六合彩开奖 1999:2013
Les normes 香港六合彩开奖 sont r茅examin茅es tous les cinq ans
Stade: 90.92 (Sera r茅vis茅e) -
Sera remplac茅e par
Projet香港六合彩开奖/DIS 1999
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